CBSE 8th Science Computer Based Exam

25 Questions | Total Attempts: 35

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CBSE 8th Science Computer Based Exam

Questions and Answers
  • 1. 
    A sound wave travels from east to west, in which direction do the particles of air move
    • A. 

      East – west

    • B. 

      North - south

    • C. 

      Up and down

    • D. 

      None of these

  • 2. 
     In which medium sound travels faster
    • A. 

      Solid

    • B. 

      Liquid

    • C. 

      Gas

    • D. 

      None of these

  • 3. 
    What is the name of short duration wave
    • A. 

      Pulse

    • B. 

      Frequency

    • C. 

      Time period

    • D. 

      Velocity

  • 4. 
    What is the velocity of sound in water at room temperature
    • A. 

      1500 m/s

    • B. 

      330 m/s

    • C. 

      1500 km/s

    • D. 

      340 km/s

  • 5. 
    The unit of quantity on which pitch of the sound depends is
    • A. 

      Hertz

    • B. 

      Metre

    • C. 

      Metre/second

    • D. 

      Second

  • 6. 
    The unit of quantity on which loudness of found depends is
    • A. 

      Metre

    • B. 

      Hertz

    • C. 

      Metre/second

    • D. 

      Second

  • 7. 
    Nature of sound wave is
    • A. 

      transverse

    • B. 

      Longitudinal

    • C. 

      Electromagnetic

    • D. 

      Seismve

  • 8. 
    Pitch of high frequency sound is
    • A. 

      High

    • B. 

      low

    • C. 

      zero

    • D. 

      Infinite

  • 9. 
    Voice of a friend is recognized by its
    • A. 

      Pitch

    • B. 

      Quality

    • C. 

      Intensity

    • D. 

      Velocity

  • 10. 
    Sound waves in air are 
    • A. 

      Longitudinal waves

    • B. 

      Radio waves

    • C. 

      Transverse waves

    • D. 

      Electromagnetic waves

  • 11. 
    Pitch is the sensation  of the ---------- of an emitted sound
  • 12. 
     A high pitch sound is called a ------ sound
  • 13. 
    A low pitch sound is called a -----------  sound
  • 14. 
    Loudness of sound wave is ditectly proportional to -------- amplitude
  • 15. 
    The sound energy transferred per unit area per unit time is called -------- of sound
  • 16. 
    When a body moves with a speed which is greater than the speed of sound in air, it is said to be traveling at --------------  
  • 17. 
    When wound waves traveling in air enter into the medium of water, ------- remains unchanged
  • 18. 
    Sound travels faster as the  ------------ of the medium increases by 0.61 m/s
  • 19. 
     -----is an apparatus which is used to find the depth of a sea or to locate the under water
  • 20. 
    A sound wave of single frequency is called ---------
  • 21. 
    The property of metals by which they can be beaten in to thin sheets is called
    • A. 

      Malleability

    • B. 

      Ductility

    • C. 

      Conduction

    • D. 

      Expansion

  • 22. 
    Which one of the following is a good conductor of electricity
    • A. 

      Iron

    • B. 

      Plastic

    • C. 

      Wood

    • D. 

      Glass

  • 23. 
    The metals that produce ringing sounds, are said to be
    • A. 

      Malleable

    • B. 

      Sonorous

    • C. 

      Lustrous

    • D. 

      Hard

  • 24. 
    Which one of the following metal reacts vigorously with oxygen and water
    • A. 

      Sodium

    • B. 

      Potassium

    • C. 

      Calcium

    • D. 

      Magnesium

  • 25. 
    Which gas are produced when metal react with acids
    • A. 

      Oxygen

    • B. 

      Nitrogen

    • C. 

      Hydrogen

    • D. 

      Carbon dioxide

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